A heel is the bottom, back part of a shoe or boot that provides elevation. The styling and construction of a heel may vary (i.e., stacked, stilletto, spiked, sculptured, kitten).
About Street Motorcycle Boots:
Street Motorcycle Boots are boots that tend to have a shorter heel than other boots, in order to allow a motorcycle rider to keep control on the bike. Street Motorcycle Boots are generally made from heavy leather and may include metal, plastic and/or composite materials to protect the rider's feet, ankles and legs in case of an accident while riding.